Evaporator structure



Vitto neg W. M. WOHL EVAPORATOR STRUCTURE Filed Oct. 17, 1945,gangers/or I "111111111111111111111', ""Ava'ra'a'l'lA m, v 'lll'.

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Fig. 3 is an elevational view of one of the evapilaiented Sept. 13, 1949EVAPORATOR STRUCTURE Waldemar M. Wohl, Cleveland, Ohio, assignor to TheYoder Company, Cleveland, Ohio, a corporation of Ohio ApplicationOctober 17, 1945, Serial No. 622,821

3 Claims. (Cl. 62-126) This invention relates to refrigeration apparatusof the cabinet type in which is mounted one or more evaporators to whichis supplied a volatile liquid refrigerant to provide a relatively lowtemperature, whereby edibles and beverages may be stored in the cabinetto prevent or retard deterioration thereof.

My improvement relates more particularly to an evaporator of the platetype, wherein the refrigerant supply connection leads into the lower endof the evaporator and the vapor discharge connection leads from theupper end thereof. As it is desirable to arrange the evaporator in closerelation to the walls of the storing compartment idiiculty arises ininstalling the supply pipe for the refrigerant and discharge pipe forthe vapor so that the cabinet wall has to be provided with an opening topermit access to these connections and in many instances the cabinet hasto be so positioned, when installed, that access to these connectionsrequire bodily movement of the cabinet.

One object of the invention therefore is to provide an improvedevaporator wherein these objections are eliminated.

Another object of the invention is to provide in apparatus of thischaracter an improved evaporator having both the outlet and inletconnection .at its upper end and provision is made for circulating therefrigerant over the entire interior area of theevaporator.

Another object of the invention is to provide in apparatus of thischaracter an improved evaporator having supply and discharge connectionsarranged to simplify and reduce the cost of the construction and tofacilitate servicing of the evaporator when installed in a cabinet fromtime to time.

Other objects of the invention will be apparent to those skilled in theart to which my invention relates from the following description takenin connection with the accompanying drawing,

wherein orators, parts being broken away.

In the drawings, I indicates as anentirety a cabinet of any desired sizeand construction, the walls of the cabinet forming a compartment 2 andinsulated in a well known manner. Preferably the inner walls of thecabinet are lined with sheet metal la. and its exterior Walls areprovided with a suitable facing material lb; the lining and facingmaterials may be utilized to protect the insulation material ic againstdeterioration and damage. The top wall of the cabinet is formed withopenings Id, the top wall and openings being preferably surfaced withthin non-corrosive material Id. 3 indicates the lids for the openingsId, each lid being provided on the lower side of its marginal portionwith a non-metallic material 4 to eliminate metal-to-metal contact withthe cabinet walls, when the lids 3 areV in closed position, as shown inFig'. 2.

5, 5, indicate two evaporators each positioned adjacent and paralleltoone inner wall of the compartment 2 and removably supported on suitablestandards I c. The evaporators are preferably related to opposed innerwalls and co-extensive in length to those opposed walls of thecompartment which are longer than any of the remaining walls thereof.Each evaporator 5 consists of two relatively thin metallic sheets 5a,5b, the marginal portions of which are welded to'- gether face-to-faceas shown at 5c. One of the metal sheets (preferably that sheetsheet5bopposed to the inner wall of the compartment when the evaporator isinstalled therein) is embossed along its upper end within the weldedportion 5c and adjacent thereto outwardly to form a conduit E, whichextends from end to end of the evaporator, the embossment terminating atone end adjacent the welded portion 5c, but provided at its opposite endwith a nipple 6a connected in a well known manner to a discharge pipe6b, leading to a suitable compressor (not shown) Below the conduit 6 andthroughout the area of the sheet 5b (within the welded portions 5c) thelatter is provided with inwardly extending spaced embossments 1, whichare elongated yin a direction at right angles to the flow of therefrigerant and arranged in horizontal and vertical rows, therebyforming connected vertical and horizontal channels 1a, 1b, respectively,between them, the lower row of horizontal embossments 1 forming a flowchannel 5d between them' and the ad- K jacent welded portion 5c inconnected relation to certain of the vertical channels 1a between these'channels 1b and thecouduit. the sheets la, Ib,

are welded together;i'ace-to-face4 as shown at 5e, except that at spacedintermediate positions the sheet 5b is embossed outwardly, as shown at8, to provide ducts leading from the channel 5:1: betweenthe upper rowof embossments 1 and the welded portion 5e to the conduit 6 for thedischarge of vapor into the latter. \9 indicates ja 'la related to thespaces between the baiiles 9 are prevented from owing directly intothese ducts, but is forced to flow through the channels 1a, 1b, abovethe bailles, whereby any liquid refrigerant escaping past thebailles lmay be completely vaporized, to avoid discharge of liquid refrigerantintothe conduit i and return thereof to the coinpressor. g

I indicates a supply inlet connection for the liquid refrigerantconnected by a suitable nipple to a pipe Illa leading from a source ofsupply. As shown, the inlet connection I0 is arranged adjacent to butbelow'the nipple 6a, whereby ready access to both the nipple connectionsresults. The discharge pipe 6b and supply pipe Illa extend throughtheadjacent wall lb, the insulation Ic and an opening la: formed in thevlin/ing or wall la for connection with the nipple 6a and inletconnection Il, respectively, the pipe 10a being provided with a suitableexpansion valve lllb. The opening- Ir is closed by a cover l0c, which isremovably held in place by screws,r to hold .the insulation materialsurrounding vthe pipes 6b and Ilia -in place. `The. cover permitsvaccess to the valve-10b.

For the purpose of supplying the liquid enter,- ing the inletlczonnection Il to the adjacent end of the chan'el 5d, Iclose thechannel 1a between the outermost vertical row of embossments 1 and theadjacent vertical row thereof, so that the closed channel 1a between theoutermost row of embossments 1 and the adjacent welded portion c forms aconduit 1a' to direct the liquid refrig-` erant to the ow channel 5d.The closure for this channel 1a may: consist of a rod vIl having adiameter equal tothe space between the sheet 5a and crown of thechannel. The rod ll I extends from the upper welded portion 5edownwardly to the channel 1b formed between the lowermost horizontal rowof embossments 1 and the adjacent horizontal row thereof.

a point remote therefrom, so that that portion of the liquid remainingin the channel 5d may freely flow into the channels 1a, 1b.

4From the foregoing description it will be observed that theconstruction of the cabinet walls is simplified and ready access to theinlet and discharge connections is provided for to facilitate servicingand that the refrigerautkis delivered toy the lower end of eachevaporator and distributed therealong for circulation upwardly, wherebythe resulting vapor may be readily drawn from the evaporator. f

To those skilled lin the art to which my invention relates, many changes.in construction and widely differing embodiments and applications ofthe invention will suggest themselves without departing from the spiritand scope of the inven; tion. My disclosures and the description herein.are purely illustrative and are not intended to be in any senselimiting.

, What I claim is:

1. An evaporator for a volatile refrigerant con.

sisting of relatively thin metallic sheets secured together along theirmarginal edges, one of said sheets being embossed outwardly parallel andad` laterally parallel and adjacent to the lower con-v nectedtogethermarginal edges of said sheets to form a now channel therebetween, adevice bet tween said sheets parallelly spaced from that end of theevaporator adjacent said outlet and extending from the upperconnected-together marginal edges to the adjacent end of said ilowchannel to, form a supply channel for the latter, an inlet for liquidrefrigerant connected to said supply channel, one of said sheetsthroughout the Y, area betweensaid conduit and said ow channel, A

. said device and the'connected-together marginal tween them horizontalAand vertical circulationl channels for the liquid refrigerant, andspaced portions of said sheets elongated parallel to said y conduit andbetween said conduit and the upper l2 indicates elements related to thechanne1` 5d for distributing the liquid' supplied to channel 5d todifferent portions of the evaporator, whereby it may circulate throughthe channels 1a, 1b, over the entire evaporator area to insure hig theat absorption eiliciency.

The distributing elements l! are preferably disposed in the channel'1bformed between the lowermost horizontal row rof embossments 1 and theadjacent row thereof and may consist of rods the diameter of which isequal to the space be-f tween the sheet 5a and crown of the vadjacentchannel. The distributing elements -are rela-1 .tively spaced to formbetween their related ends;

outlets 12a for the liquid refrigerant, the outer end of the element I2adjacent to the closure II being secured thereto and the element I2 atthe opposite end of the evaporator 5 terminating at horizontal row ofembossments being secured together to form outlet ducts leading fromsaidv vertical circulation channels to said conduit.

v 2. An evaporator as claimed in claim 1 wherein are provided spaceddistributing devices disposed parallel to said flow channel and betweensaid flow channel and the lower ends of said vertical circulationchannels.

3. An evaporator as claimed in claim 1, wherein spaced bailles aredisposed parallel to and spaced from said secured together portions, thespaces `between said baiiles being out of alinement with said outletducts.

, WALDEMAR M. WO1-1L.

REFERENCES CITED file of this patent: t

UNITED' STATES PATENTS Beane May 23, 1944 The following references areof record in the

